The seventh dart falls low of the treble 20, but it's all about taking the leg against the darts for Luke Littler.

On 50, he hits treble 10 and double 10 to bring him within two legs of Gary Anderson.

Luke Littler on a nine-darter...

Luke Littler hits double five to reduce his gap once more.

Rod Studd
Commentator on Sky Sports

Have we reached the point where Luke Littler's legs throwing first aren't that important to Gary Anderson? All he has to do is hold and he'll win this semi-final.

Both players fail to find a treble with their first visit but Gary Anderson seizes control of leg 22 with a maximum - surprisingly, only his fourth 180 of the match.

Double top is landed and Anderson is three legs away now.

More of this required by Luke Littler, who holds throw with ease.

He leaves 41 after nine darts and gets it wrapped up in 13.

Luke Littler is averaging exactly 105 over the first 20 legs and yet the 17-year-old still finds himself 12-8 behind in a race to 16.

Gary Anderson's average is at 102.60, but it has been his finishing that has been the difference. Some massive checkouts have put him on the brink of the final.

Can Littler find a way back?

Rod Studd
Commentator on Sky Sports

Gary Anderson is in control and in command. He is in imperious form.

Luke Littler knows he has got a lot of work to do here. He's got problems.

One of the features of Gary Anderson's quarter-final win over Gian van Veen was that he was rock solid on his own throw down the final stretch.

He holds again here in the last leg before the final break, after Luke Littler misses a chance at the bull for a 122 finish.

Anderson leads by four and is four legs away from a third Grand Slam final appearance.

Luke Littler stops the rot on his old faithful, double 10, and holds throw.

Anderson's run of leg wins ends at seven.

Glen Durrant
Former Premier League champion on Sky Sports

Will there be any panic from Luke Littler?

It feels like both players still have another gear.

Rod Studd
Commentator on Sky Sports

Image source, Kieran Cleeves/PDC

Gary Anderson is running riot. He's threatening to run clear in improbable fashion.

There are few finer sights in darts than Gary Anderson in this kind of rhythm.

He's had a lean few years on the oche and had slipped to 20th in the PDC rankings before this Grand Slam event, but this is somewhere close to his best.

Luke Littler misses the bull for a 170 and Anderson gets a 102 checkout for a four-leg lead.

Make it six legs in a row for Gary Anderson, who from 7-4 down is now 10-7 up in this first-to-16 semi-final.

Glen Durrant
Former Premier League champion on Sky Sports

It was looking like one-way traffic but it has been five legs on the spin for Gary Anderson now. He's looking absolutely wonderful.

Luke Littler needs resilience and fight now.

Gary Anderson averaged more than 119 in legs 11-15 to get himself back in front in this semi-final.

And he's two legs in front now, thanks to a 52 finish.

Martin Lukeman, who beat Mickey Mansell 16-12 earlier, awaits the winner of this one in tonight's final.

At the break, Sky Sports have shown an advert publicising their coverage of the World Championship, which starts next month.

Can. Not. Wait.

Gary Anderson almost sprinted off the stage after that 142 finish.

Luke Littler was a little more circumspect, with a shrug of the shoulders and a look on his face as if to say "there's not too much I can do about that".

Image source, Kieran Cleeves/PDC

Magnficent from Gary Anderson!

Luke Littler gets unfortunate with a bounce-out as he tries to take out 130, but up steps Anderson with a brilliant 142 and the 53-year-old is back in front.

What a match this is! Don't go off for a break, lads - keep it going!

Both men averaging north of 103 now. This one has really caught fire in the past 10 minutes.

Gary Anderson, yet again, hits a winning double with his final dart and we're back level.